Yerotia, Swarmmancer

Eminence - Whenever a Sliver creature you
control dies, if Yerotia, Swarmmancer is in the
command zone or on the battlefield, create a 2/2
black Zombie creature token.
Other Sliver creatures you control have undying.
Exile a Sliver creature card from your graveyard:
Return target Zombie creature card from your graveyard to the battlefield